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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0b46aec993e544d83b981b4098cf56a7c611c745ecf74ad252d40701f5cd401' 
  AND token = 'kBUaO4YpB/E+RPS92cQDeALZu8dfoLpLnGNbCNRIigo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}